Calculation of dose distributions for iridium-192 implants

After reviewing the method of Hall et coll. (1966) for calculating dose rates from 192Ir wire, small changes and improvements were made and a computer program was written to calculate dose distributions. It was found that the wire position data obtained from films and supplied to the program was the largest source of inaccuracy but that with care the maximum error in the calculated dose rates was 3 per cent. If the original cross-line curves are still used for calculations the additional error introduced into the dose rates at distances of up to 4 cm from the wire is less than one per cent.